Where Did Earth's Water Come From? & How Do We Know? GEO GIRL

Earth has an abundance of water at its surface (and even more within its interior!), but where did all Earth's water come from? In this video, I cover all the hypotheses regarding the origins of Earth's water and how we study the potential sources of Earth's water and how much they may have contributed using isotopes! Hope you enjoy ;D

0:00 Water in the early solar system
3:07 Outgassing vs Impacts
4:24 Rocks containing water
5:21 Oceans in Earth’s interior
6:11 Where Earth’s water came from?
8:47 Isotopes for tracking Earth’s water origin
11:55 Another hypothesis
13:37 Water on other planets?
14:58 Why we care about water’s history
16:05 Complications w/isotope tracking
20:04 Where you can learn more!

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Disclaimer: Links included in this description might be affiliate links. If you purchase a product or service with the links that I provide I may receive a small commission, but there is no additional charge to you! Thank you for supporting my channel so I can continue to provide you with free content each week! And as always, let me know your topic suggestions in the comments down below!

[toastyburger]

As a layperson, I find your lectures to have just the right depth. Your language and explanations of technical terms are accessible, yet I never feel you're talking down to your audience.

[Tink]

They should call you "Universe Girl" because you just taught me why the gas giants are located in the outer solar system. I've been into astronomy for a long time but never knew that!

[spindoctor]

Thank you for another great video. So many so called science videos are barely more than a list of facts (often not even that) The "how do we know?" Part is the only part that transfers real knowledge. You have a beautiful balance of educating and entertaining without talking down to the viewers.
I have come to expect this from you but never want to just take it for granted.

[AsadRehmanism]

Just Awesome. I don't know how I remain hookedup for the whole video (this long). I guess your explaination is just so engaging.

[brian_on_youtube]

This was a fascinating topic. I was previously unaware of hydrodynamic escape and isotopic fractionation.

[luc]

I know it's hard to believe and weird, just few minutes ago I was randomly asking myself where Water came from . and then Found your video when I opened YouTube.

[kerriemckinstry-jett]

I don't think you're going to get any complaints from the astronomers on here. 🙂 You did a nice job covering the parts of the nebular hypothesis which apply to this situation.
I always have to warn my students that, "We're reasonably confident about this based on current observations, but we could encounter new data which calls for a revision." Yes, the question about the origin of Earth's water has evolved since I was in college! If it makes anyone feel better, one of my college professors told us that when he did his doctoral presentation, virtually everything he said to his thesis committee about Saturn is currently known to be incorrect! At the time that he told us that, he was very excited, along with the rest of his team, to see Cassini successfully launched... and we all know that the Cassini mission caused everyone to revise what they knew about Saturn all over again! 😂
Edited: slight edit of spelling

[jcalene]

Thanks or the video. I read somewhere a few years ago that Saturn's rings have been found to contain water with a very similar isotope ratio to that of Earth's. That is mind-blowing if true - as it suggests a common external source during the formation of the solar system. I need to find the reference for it.

[michaeleisenberg]

Rachel, Thank you very much for this video 📽️. I think a long time ago I asked you about this in one of my early comments. Excellent job 💯!

[craiggillas]

Great Job! Thank you for your time, dedication and clarity.

[newman]

Another fantastic vid, entertaining & educational. 👍

[Alberad]

Interesting topic - thank you very much for this video!

[TheDanEdwards]

Good video, not too long but long enough to have real content. And while water always gets all the attention, I find the question _How did Earth end up with so much _*_nitrogen_*_ ?_ almost never is discussed. And in the question of life on planets, nitrogen is just as important as water. All living things are made from nitrogen compounds. Nitrogen as N2 or as ammonia would have, like water, been pushed outwards by the young Sun.

Mars seem to be nitrogen poor, compared to Earth.

Venus' atmosphere also has nitrogen, and I think a good discussion can be had that both Venus and Earth were radically changed early on by impacts. Venus ended up rotating on its axis contrary to the other planets and its own orbit, a sign that something big happened.

[PlayNowWorkLater]

Great video, as always. You’re really dialing in your method of delivery with these videos. And as an audience member, who has some knowledge of a bunch of different sciences, I really enjoy the level at which you teach and explain. Looking forward to more of your videos up and coming, especially the one on early tectonics. I didn’t realize that you were a geochemist before this. And I can see why you talk so much about isotopes. It’s very interesting stuff

[dozhk]

The quality of your content has improved a lot. I don't know if it's me but you sound and look better. Keep up the good work! Greeting from Chile <3.

[Scottabamos]

Congratulations on the sponsorship! And thanks for another very interesting video!
Does the moon have a lot of water locked away in hydrated minerals as well? If not, is it just that the moon has lost all water that was once there to space because of the lack of atmosphere?
Also, would it be possible to do an update to this video once the findings from Osiris-rex are announced because I think what we find from that astroid sample may help us better understand this subject. Thanks!

[thylacoleonkennedy]

7:48 I _think_ I get what you mean - the initial material was dehydrated minerals and at a later point water was 'brought in' from outer areas of the solar system where hydrated minerals were more stable and it was transferred from the hydrated non-Earth minerals to the dehydrated material that eventually formed Earth. Something like that?

[punditgi]

Geo Girl is amazing! Love these fantastic videos! ❤🎉😊

[cavetroll]

very cool video and excellent topic thanks :)

[shadeen]

Another brilliant lecture very interesting thank you geo girl